body{
    margin:0;
    padding-bottom: 60px;
}

footer{
    position: fixed;
    bottom: 0;
    width: 100%;
    background-color: #f93;
    display: flex;
}

input{
    flex-grow: 1;
    border: none;
    margin: 10px;
    padding: 10px;
}

section{
    padding: 10px;
    background-color: #eee;
}

section:nth-child(2n+1){
    background-color: #ddd;
}